*?,+?,??
|
以上三个取第一个匹配结果（非贪婪匹配） |
<*>匹配<br style="word-wrap: break-word" />
</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">{m,n}<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">对于前一个字符重复m到n次，{m}亦可<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">a{6}匹配6个a、a{2,4}匹配2到4个a</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">{m,n}?<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">对于前一个字符重复m到n次，并取尽可能少<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">‘aaaaaa'中a{2,4}只会匹配2个</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">"\"<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">特殊字符转义或者特殊序列</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px"><br style="word-wrap: break-word" />
</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">[]<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">表示一个字符集</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">[0-9]、[a-z]、[A-Z]、[^0]</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">"|"<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">或</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">A|B,或运算</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">(...)<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">匹配括号中任意表达式</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px"><br style="word-wrap: break-word" />
</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">(?#...)<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">注释，可忽略</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px"><br style="word-wrap: break-word" />
</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">(?=...)<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">Matches if ... matches next, but doesn't consume the string.<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">'(?=test)' 在hellotest中匹配hello</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">(?!...)<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">Matches if ... doesn't match next.<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">'(?!=test)' 若hello后面不为test，匹配hello<br style="word-wrap: break-word" />
</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">(?<=...) <br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">Matches if preceded by ... (must be fixed length).<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">'(?<=hello)test' 在hellotest中匹配test<br style="word-wrap: break-word" />
</td>
</tr>
<tr style="word-wrap: break-word">
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">(?
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">Matches if not preceded by ... (must be fixed length).<br style="word-wrap: break-word" />
</td>
<td style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; word-wrap: break-word; padding-top: 0px">'(?
</td>
</tr>
</tbody>
</table>
<br class="Apple-interchange-newline" />
</p>
<p>匹配的标志和含义</p>
<p>
<table border="8" align="left" style="border-bottom: silver 1px solid; text-align: left; border-left: silver 1px solid; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 0px; padding-left: 0px; border-spacing: 0px; width: 320px; padding-right: 0px; border-collapse: collapse; font: 14px/21px Verdana, Arial, Helvetica, sans-serif; white-space: normal; letter-spacing: normal; height: 141px; color: rgb(0,0,0); border-top: silver 1px solid; border-right: silver 1px solid; word-spacing: 0px; padding-top: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">
<tbody style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<tr style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">标志</td>
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">含义</td>
</tr>
<tr style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">re.I</td>
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">忽略大小写</td>
</tr>
<tr style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">re.L</td>
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">根据本地设置而更改w,W,,B,s,S的匹配内容</td>
</tr>
<tr style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">re.M</td>
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">多行匹配模式</td>
</tr>
<tr style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">re.S</td>
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">使“.”元字符匹配换行符</td>
</tr>
<tr style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">re.U</td>
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">匹配Unicode字符</td>
</tr>
<tr style="padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px">
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">re.X</td>
<td style="border-bottom: silver 1px solid; border-left: silver 1px solid; padding-bottom: 3px; margin: 0px; padding-left: 3px; padding-right: 3px; border-collapse: collapse; border-top: silver 1px solid; border-right: silver 1px solid; padding-top: 3px">忽略需要匹配模式中的空格，并且可以使用"#"号注释</td>
</tr>
</tbody>
</table>
</p>
<br />
</p>
<p>文本内容（提取Linux下的password文件）</p>
<div class="51ds_code" style="position: relative;"><pre class="brush:py;">
man:x:6:12:man:/var/cache/man:/bin/nologin
</pre></div>
</p>
<p>re模块中有３个搜索函数，每个函数都接受３个参数(匹配模式，要匹配的字符串，进行匹配的标志)，如果匹配到了就返回一个对象实例，么有就返会Ｎone．</p>
<p>findall():用于在字符串中查找符合正则表达式的字符串，并返回这些字符串的列表</p>
<p>search():搜索整个字符串，返回对象实例</p>
<p>match():只从第一个字符开始匹配，后面的不再匹配，返回对象实例</p>
<div class="51ds_code" style="position: relative;"><pre class="brush:py;">
lovelinux@LoveLinux:~/py/boke$ cat text
man:x:6:12:man:/var/cache/man:/bin/sh
lovelinux@LoveLinux:~/py/boke$ cat test.py
#/usr/bin/env python
#coding:utf-8
import re
with open('text','r') as txt:
f = txt.read()
print re.match('bin',f)
print re.search('bin',f).end()
lovelinux@LoveLinux:~/py/boke$ python test.py
None
34
lovelinux@LoveLinux:~/py/boke$ vim test.py
lovelinux@LoveLinux:~/py/boke$ python test.py
None
<_sre.SRE_Match object at 0x7f12fc9f9ed0>
</pre></div>
</p>
<p>返回是对象实例有２个方法，</p>
<p>start()：返回记录匹配到字符的开始索引 </p>
<p>end()：返回记录匹配到字符的结束索引</p>
<div class="51ds_code" style="position: relative;"><pre class="brush:py;">
lovelinux@LoveLinux:~/py/boke$ python test.py
None
31
34
lovelinux@LoveLinux:~/py/boke$ cat test.py
#/usr/bin/env python
#coding:utf-8
import re
with open('text','r') as txt:
f = txt.read()
print re.match('bin',f)
print re.search('bin',f).start()
print re.search('bin',f).end()
</pre></div>
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<h4>pythonre正则表达式模块(RegularExpression)</h4>
<div class="co">pythonre正则表达式模块(RegularExpression):模块的的作用主要是用于字符串和文本处理，查找，搜索，替换等 复习一下基本的正则表达式吧 .：匹配除了换行符以为的任意单个字符 *：匹配任意字符，一个，零个，多个都能匹配得到 俗称贪婪模式 +：匹配位于+之前的一个或者多个字符 |：匹配位于|之前或者</div>
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